I have an early Crass model, SN 153xx, grade 2. The company name is stamped on the sides of the receiver with engraved scrolling. The bottom of the receiver is deeply engraved in the grade 2 style.

It also came with a second set of barrels, 21 3/4", with matching serial number. The first set are 30".

Were 2 barrel sets common to Crass manufactor?